Requirements for the Model Aircraft

Requirements for the Model Aircraft

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I. General characteristics

  1. Maximum overall span 1500 mm.
  2. Maximum overall length 1500 mm.
  3. Maximum total weight, with batteries 300g and with additional materials (for F3P-AFM model aircraft; ie confetti, streamers etc).
  4. External parts that protrude which could be considered dangerous, (ie landing gear struts, shaft tips etc) must be covered in order to avoid injuries.

Note! A tolerance of 1% will be allowed for possible inconsistencies in measurement instruments for size and weight.


  1. Power device limitations: any suitable power device may be utilised except those generating any kind of exhaust emission.
  2. The propulsion device(s) must automatically shut-off or fully idle at the moment an RC signal failure occurs.
  3. Radio equipment shall be of the open loop type (ie no electronic feedback from the model aircraft to the ground except for the stipulations in CIAM General Rules C.16.2.3). Auto-pilot control utilising inertia, gravity or any type of terrestrial or non-terrestrial reference is prohibited. Automatic control sequencing (pre-programming) or automatic control timing devices are prohibited.

Example - permitted

  1. Control rate devices that are manually switched by the pilot.
  2. Any type of button or lever, switch, or dial control that is initiated or activated and terminated by the competitor.
  3. Manually operated switches or programmable options to couple and mix control functions.

Example – not permitted

  1. Snap roll buttons with automatic timing mode.
  2. Pre-programming devices to automatically perform a series of commands.
  3. Auto-pilots or gyros for automatic wing levelling or other stabilisation of the model aircraft.
  4. Automatic flight path guidance.
  5. Propeller pitch change with automatic timing mode.
  6. Any type of voice recognition system.
  7. Any type of learning function involving manoeuvre to manoeuvre or flight to flight analysis

II. Identification marks

Model aircraft shall carry:

  1. The national identification mark followed by the FAI Unique ID number. The letters and numbers must be at least 25 mm high and appear at least once on each model.

Note! The list of the national identification marks (3 letters per country) is downloadable from “Documents” section of the CIAM website

Note! The mandatory carrying of the FAI ID number commenced in 2022.

  1. A FAI sticker containing: national identification mark and number, competitor’s name and model aircraft identification code (has to be different for each nominated model aircraft of the competitor; the code must be recorded on the Model Aircraft Specification Certificate).

Note! FAI stickers’ design is downloadable from “Documents” section of the CIAM website See example below.


The minimum FAI sticker size is 55 mm x 30 mm.

  1. A model identification code (letters and/or numbers) should appear on each main part of the model (wing(s), tail, front and rear fuselage if detachable) so that the individual parts of a competitor's different models may be separately identified. The letters and/or numbers must be at least 10 mm high and clearly visible.

Note! A model aircraft must not carry a national identification mark, an FAI licence number, an FAI sticker, or any other reference which relates to any person other than the competitor.

Recommendation! As weight of the model aircraft is crucial, we recommend using ultralight waterslide paper used for decorating plastic scale models. Laser printer should be used for printing.

Rules to remember

  1. A model may only be used by one competitor during a contest.
  2. The competitor may provide himself with spare propellers, electric motors, etc. A competitor may interchange various parts as he wishes, provided the resulting model conforms to the rules of the contest and that the parts have been checked before the start of the contest.
  3. Repairs are permitted provided that the model still conforms to the requirements of the rules and regulations.

III. Control procedure - model processing

General characteristics, marking (stickers) of participant’s model aircraft will be verified in processing procedures as per FAI Sporting Code, Section 4, Volume CIAM General Rules, for each participating model aircraft prior to a competition.

Role of each NAC

For World Championships each NAC shall process every model and shall issue for each model aircraft a Model Aircraft Specification Certificate, provided by the FAI.

Note! The Model Aircraft Specification Certificate is only available as a download from “Documents” section of the CIAM website

Role of Event Organisers

Organisers guarantee implementation of model processing procedure according to the FAI rules and regulations.

The certain time will be set up for every team to go thought the model processing procedure. Each participant shall present to the competitions’ officials:

1) model aircraft (-s) he/ she is planning to use in the competition (ready to fly);

2) Model Aircraft Specification Certificate (-s) for each of his model aircraft;

3) radio signal transmitter;

4) signed Technical Compliance Form (for will be provided with Bulletin 3).

Model aircraft not properly processed by their NAC, with FAI certificates and stickers, will be processed by the organiser at a cost of 8 Euro for each model.

Rules to remember

  1. When, after official checking a model is lost or damaged, the competitor shall have the right to present a further model and corresponding model specification certificate for checking up to one hour before the official starting time of the contest in that class.
  2. The competitor may have only the eligible number of models entered at the start of the contest. For the F3P-A and F3P-AFM the eligible number of models – 3 (three) for each class.
  3. Results are subject to the re-checking of the characteristics of the first, second and third place winning models.
  4. If a competitor or a class team (not the National Team) refuses to submit his model or engine for processing or refuses to comply with the FAI Jury's request during a processing procedure, he or the class team shall be disqualified from the competition.


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